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This BLM map depicts the principal meridians and baselines used for surveying states (colored) in the PLSS.. In the United States Public Land Survey System, a principal meridian is the principal north–south line used for survey control in a large region, and which divides townships between east and west.
The baselines are defined as "the low-water line along the coast or on a low-tide elevation that is situated wholly or partly at a distance not exceeding the breadth of the territorial sea of Canada from the mainland or an island," [2] and the territorial sea is defined as extending 12 nautical miles (22 km) from the points of the baselines, or such other points as may be prescribed.
The First Baseline is at 49° north, which forms much of the Canada–United States border in the West. Each subsequent baseline is about 24 miles (39 km) to the north of the previous one, [10] terminating at 60° north, which forms the boundary with Yukon, the Northwest Territories, and Nunavut.
Figure 1. This BLM map depicts the principal meridians and baselines used for surveying states (colored) in the PLSS. The following are the principal and guide meridians and base lines of the United States, with the year established and a brief summary of what areas' land surveys are based on each.
Baseline Road in Hillsboro, Oregon, generally follows the Willamette Baseline which intersects the Willamette Meridian at the Willamette Stone State Park. Base Line Road in Roseville California , was known as "Base Line Road" until the City (incorrectly at the time) named the section of road within their incorporated area, "Baseline Road".
Townships in relation with meridians, baselines and correction lines. Below is a brief description of how to lay out the DLS grid for Alberta. [3] [4]Lay off 6-mile-3-chain (9.7 km) ticks from the 49th parallel of latitude to the 60th parallel.
Map of territorial growth, 1775 Northwest territory Monument referencing the beginning point of the PLSS. Originally proposed by Thomas Jefferson to create a nation of "yeoman farmers", [1] the PLSS began shortly after the American Revolutionary War, when the federal government became responsible for large areas of land west of the original thirteen states.
Map all coordinates using OpenStreetMap. Download coordinates as: KML; ... The 40th parallel north is the southern baseline for Canada's National Topographic System.
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